A theory of coherent X-ray radiation generated by a beam relativistic electrons in single crystal the direction close to electron-beam axis is developed Laue scattering geometry. The takes into account asymmetry electron-field reflection with respect surface and divergence. Expressions describing spectral-angular densities parametric near electron-velocity direction, transition radiation, their...

The relativistic expressions for the anti-hermitian (damping) parts of the dielectric tensor elements can be expressed as a single integral over the parallel momentum variable (see Eq.(1) below). A computer program has been written for the calculation of this single integral [1]. The numerical results are tested for a relativistic Maxwellian distribution and agree with analytical expressions de...

We re-analyze the Chandra ACIS spectrum of the kpc-scale jet in PKS 0637–752 to investigate the possible low energy cutoff in the relativistic electron spectrum producing the non-thermal radiation in the scenario of inverse Compton emission off the cosmic microwave background. This was among the first objects targeted by the Chandra Observatory and gives a unique opportunity to study the low en...

Ab__•S_.•_• High-energy electrons have been measured systematically in a low-altitude (520 x 675 km), nearly polar (inclination = 82 ø) orbit by sensitive instruments onboard the Solar, Anomalous, and Magnetospheric Particle Explorer (SAMPEX). Count rate channels with electron energy thresholds ranging from 0.4 MeV to 3.5 MeV in three different instruments have been used to examine relativistic...

A new scheme of electron acceleration, employing relativistic electron bunches in a cold plasma, is analyzed. The wake field of a leading bunch is derived in a single-particle model. We then extend the model to include finite bunch length effect. In particular, we discuss the relation between the charge distributions of the driving bunch and the energies transformable to the trailing electrons....

I first review basic models for laser-plasma interaction that explain electron acceleration and beam confinement in plasma. Next, I discuss ponderomotive electron acceleration in infinite vacuum, showing that the transverse scattering angle of the accelerated electron may be kept small with a proper choice of parameters. I then analyze the direct (a.k.a. linear) acceleration of an electron in i...

A self-generation mechanism of magnetic dipoles and the anomalous energy dissipation of fast electrons in a magnetized beam-plasma system are presented. Based on two-dimensional particle-in-cell simulations, it is found that the magnetic dipoles are self-organized and play important roles in the beam electron energy dissipation. These dipoles drift slowly in the direction of the return flow wit...

Numerical solutions, to the fully relativistic equations of motion of a single electron injected sideways into the focal point of a tightly-focused laser beam, show that accurate electron energy gain calculations require that terms of order ε and higher, where ε is the diffraction angle, ought to be included in the description of the fields of a Gaussian beam focused down to a 5 μm waist radius...